Answer by Chinny84 for Why does Derivative Within Summation Get Rid of...
It is "easy" once you write out the few terms in the series.Your example, we are taking the derivative w.r.t to $y_j$.Thus the only part of the summation we need to consider is the numerator in the...
View ArticleWhy does Derivative Within Summation Get Rid of Summation?
On the second-to-last line of page 4 of this document, a mathematical step is performed that I cannot understand. This step leads to an answer that I have seen many other places, so the step is likely...
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